(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
Cargo Commander is on sale for $2.49 / £1.74 as the GamersGate / GamersGate UK Daily deal for 5/14/13.
Requires Steam activation.
(weird, I posted this last night but it never updated for some reason.)